US7487468B2 - Video combining apparatus and method - Google Patents

Video combining apparatus and method Download PDF

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Publication number
US7487468B2
US7487468B2 US10/671,611 US67161103A US7487468B2 US 7487468 B2 US7487468 B2 US 7487468B2 US 67161103 A US67161103 A US 67161103A US 7487468 B2 US7487468 B2 US 7487468B2
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image
user
video
unit
region
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US20040070611A1 (en
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Rika Tanaka
Toshikazu Ohshima
Kaname Tomite
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Canon Inc
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Canon Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
    • H04N5/44504—Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/4104—Peripherals receiving signals from specially adapted client devices
    • H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/4143—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a Personal Computer [PC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/4223—Cameras
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof
    • H04N21/42653—Internal components of the client ; Characteristics thereof for processing graphics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/442—Monitoring of processes or resources, e.g. detecting the failure of a recording device, monitoring the downstream bandwidth, the number of times a movie has been viewed, the storage space available from the internal hard disk
    • H04N21/44213—Monitoring of end-user related data
    • H04N21/44218—Detecting physical presence or behaviour of the user, e.g. using sensors to detect if the user is leaving the room or changes his face expression during a TV program
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/222—Studio circuitry; Studio devices; Studio equipment
    • H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/272—Means for inserting a foreground image in a background image, i.e. inlay, outlay
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/422—Input-only peripherals, i.e. input devices connected to specially adapted client devices, e.g. global positioning system [GPS]
    • H04N21/42204—User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor
    • H04N21/42206—User interfaces specially adapted for controlling a client device through a remote control device; Remote control devices therefor characterized by hardware details
    • H04N21/42222—Additional components integrated in the remote control device, e.g. timer, speaker, sensors for detecting position, direction or movement of the remote control, microphone or battery charging device

Definitions

  • the present invention relates to video combining apparatus and method for superimposition of video image and information generated by a computer (CG: Computer Graphics) on a video image of the real world, and more particularly, to CG image display control on an area of real space to which a user is to pay attention.
  • CG Computer Graphics
  • AR Augmented Reality
  • MR Mixed Reality
  • a technique to display a particular real object e.g., a user's hand
  • an always-visible object mask processing technique
  • the present invention has been made in consideration of the problems of the conventional techniques, and has a main object to realize a video combining apparatus for superimposition of a computer-generated image on the real world observed by a user, in which CG image display is not made in a particular real-space area to which the user pays attention with simple setting.
  • a video combining method for superimposing a virtual image generated by a computer on the real world observed by a user comprising the steps of: inputting an image obtained by image sensing the real world; inputting position and orientation information of the user's view point; generating a virtual image based on the position and orientation information; extracting a virtual image elimination area of the virtual image; and combining the virtual image with the image obtained by image sensing based on the virtual image elimination area.
  • a video combining apparatus for superimposing a virtual image generated by a computer on the real world observed by a user, comprising: image input unit adapted to input an image obtained by image sensing the real world; position and orientation information input unit adapted to input position and orientation information of the user's view point; virtual image generation unit adapted to generate a virtual image based on the position and orientation information; elimination area extraction unit adapted to extract a virtual image elimination area of the virtual image; and combining unit adapted to combine the virtual image with the image obtained by image sensing based on the virtual image elimination area.
  • a video combining method for superimposing a virtual image on a video image of the real world observed by a user comprising: an image input step of inputting a video image of the real world observed by the user; a position and orientation information input step of inputting position and orientation information of the user's view point; a virtual image generation step of generating a virtual image based on the position and orientation information; a designated area detection step of detecting a predetermined area designated by the user; and a superimposition step of superimposing the virtual image on the video image except a portion corresponding to the area in the video image detected at the designated area detection step.
  • a computer-readable medium holding program code to realize a video combining method for superimposing a virtual image generated by a computer on the real world observed by a user, by a computer comprising: process procedure code for inputting an image of the real world obtained by image sensing; process procedure code for inputting position and orientation information of the user's view point; process procedure code for generating a virtual image based on the position and orientation information; process procedure code for extracting a virtual image elimination area; and process procedure code for combining the virtual image with the image obtained by image sensing based on the information on the virtual image elimination area.
  • a computer-readable medium holding program code to realize a video combining method for superimposing a virtual image on a video image of the real world observed by a user comprising: process procedure code for inputting a video image of the real world observed by the user obtained by image sensing; process procedure code for inputting position and orientation information of the user's view point; process procedure code for generating a virtual image based on the position and orientation information; process procedure code for detecting a predetermined area designated by the user; and process procedure code for superimposing the virtual image on the video image obtained by image sensing except a portion corresponding to the area in the video image detected at the detection process.
  • FIGS. 1A and 1B are explanatory views showing the conception of the present invention for designation of a CG elimination area using a frame;
  • FIGS. 2A to 2D are examples of a CG elimination frame
  • FIG. 3 is a block diagram showing an example of the construction of a video combining apparatus according to a first embodiment of the present invention
  • FIG. 4 is a flowchart showing an operation of the video combining apparatus according to the first embodiment
  • FIGS. 5A and 5B are explanatory views of a stylus used in the video combining apparatus according to a second embodiment of the present invention.
  • FIG. 6 is a block diagram showing an example of the construction of the video combining apparatus according to the second embodiment
  • FIG. 7 is a flowchart showing the operation of the video combining apparatus according to the second embodiment.
  • FIG. 8 is an explanatory view showing a method of designation of CG elimination area in the video combining apparatus according to a third embodiment of the present invention.
  • FIGS. 9A and 9B are explanatory views showing the method of designation of CG elimination area, by a user's hand(s), in the video combining apparatus according to the third embodiment;
  • FIG. 10 is a block diagram showing an example of the construction of the video combining apparatus according to the third embodiment.
  • FIG. 11 is a flowchart showing the operation of the video combining apparatus according to the third embodiment.
  • FIG. 12 is a flowchart showing the operation of CG elimination area extraction according to the third embodiment.
  • FIG. 13 is a flowchart showing the operation of CG elimination area extraction according to the third embodiment.
  • An example of a video combining apparatus is an MR system for auxiliary display of position information and names in correspondence with a landscape viewed by a user wearing a display device.
  • a video see-through HMD capable of position and orientation measurement is employed as the display device. That is, the HMD includes a position and orientation sensor and a camera, and a video image from the user's approximate view point position can be obtained based on position and orientation information (strictly, the position and orientation of the camera) of the user's head.
  • CG elimination area an area on which the user does not want CG image superimposition
  • a user interface hereinbelow, referred to as a “CG elimination frame” with markers associated with the CG elimination area is employed.
  • the CG elimination area is extracted from the video image from the user's view point position by extracting a marker provided in the CG elimination frame.
  • FIGS. 2A to 2D show examples of the CG elimination frame (association between the markers and the CG elimination area).
  • the CG elimination frame is used under the constraint that it is used in parallel to an image sensing plane of the camera (image sensing unit) provided in the HMD.
  • Small circles indicate the markers, and a hatched portion indicates the CG elimination area.
  • the hatched portion may or may not exist. If the hatched portion exists, the hatched portion should be made of transparent or semi-transparent material, or an input means to input an image of real world corresponding to the hatched portion is required.
  • the CG elimination frame has a handgrip 21 which the user holds and a frame 22 . When the user observes a superimposed image as shown in FIG.
  • the display device is an optical see-through type device, however, the arrangement thereof is the same except that the real world is directly observed through the display device.
  • FIG. 2A three markers as one set are provided in every four corners of a rectangular frame.
  • the CG elimination area can be calculated only if any one of the four marker sets is extracted.
  • FIG. 2B markers are provided surrounding a circular frame. Since a circle can be defined by three points, if arbitrary three markers are extracted, the internal area thereof can be calculated as a CG elimination area.
  • FIG. 2C show a variation that three of the markers in FIG. 2B are used. This arrangement is effective when markers attached to the CG elimination frame as shown in FIG. 2C make the appearance of the flame being troublesome.
  • FIG. 2D an area (circle in this figure) ahead of a marker having directionality is defined as a CG elimination area. This arrangement is effective in a case where a marker is not to be placed on the boundary between a CG image drawing portion and a CG elimination area.
  • the color of the frame can be arbitrarily determined, however, considering that generally a fluorescent color or the like not used in real objects is used for the marker for assistance of detection, a color contrastive to the marker is preferably used for the frame.
  • the size of the frame (the size of CG elimination area) is arbitrarily determined, however, if the frame is too large, the CG elimination area is too large and most of the CG image included in the field of view cannot be displayed; on the other hand, if the frame is too small, the position control of the frame becomes difficult. Accordingly, an arbitrarily frame size is set in consideration of general hand length (in consideration of a variable range since the percentage of the frame in the image changes in correspondence with the distance from the camera to the frame).
  • FIG. 3 is a block diagram showing an example of the construction of the video combining apparatus according to the first embodiment of the present invention.
  • an image sensing unit 1 is a camera included in the HMD.
  • the image sensing unit 1 obtains video images of real space observed by the user's right eye and left eye, and outputs the obtained video images as video signals to a video capturing unit 2 .
  • processing for the right eye image and processing for left eye image are not separately described.
  • processing for right eye and processing for left eye are performed.
  • the video capturing unit 2 converts the video signal inputted from the image sensing unit 1 into signal of format suitable for processing in a video combining unit 6 and a CG elimination area extraction unit 3 , and outputs the signal to the video combining unit 6 and the CG elimination area extraction unit 3 .
  • the CG elimination area extraction unit 3 extracts the markers provided in the CG elimination frame from the video images inputted from the video capturing unit 2 and extracts a CG elimination area. The area on the video image is the CG elimination area. Then the CG elimination area extraction unit 3 outputs the extracted CG elimination area to the video combining unit 6 .
  • An image-sensing position and orientation measurement unit 4 included in the HMD in this embodiment, transmits position and orientation information of the image sensing unit 1 to a CG generation unit 5 in accordance with or without a request from the CG generation unit 5 .
  • a geomagnetic sensor, a gyroscopic or an optical sensor or the like may be utilized as the image-sensing position and orientation measurement unit 4 .
  • the CG generation unit 5 obtains the position and orientation information of the image sensing unit 1 from the image-sensing position and orientation measurement unit 4 , and estimates the position and image sensing direction of the image sensing unit 1 . Since the field of view can be obtained from a lens parameter of the image sensing unit 1 if the position and image sensing direction of the image sensing unit 1 are estimated, the CG generation unit 5 reads data included in the field of view of the image sensing unit 1 from a data unit 7 , generates a CG image to be superimposed on the video image obtained by the image sensing unit 1 , and outputs the CG image to the video combining unit 6 .
  • the video combining unit 6 reads the video image from the video capturing unit 2 , the CG image from the CG generation unit 5 , and the CG elimination area from the CG elimination area extraction unit 3 . Then the video combining unit 6 combines the CG image from the CG generation unit 5 with the video image from the video capturing unit 2 . At this time, the CG image is not drawn in a portion overlapped with the CG elimination area obtained by the CG elimination area extraction unit 3 . In this manner, a combined video image where only the CG image is eliminated from the CG elimination area is generated.
  • the CG elimination frame having the appearance correspond with its function is more preferable as a user interface. Further, it may be arranged such that instead of restraint of CG image drawing in the CG elimination area, a CG image with high transparency (by controlling an a component value indicating transparency) is drawn or a CG image is blinked in correspondence with the type of the CG elimination frame.
  • the CG image generated by the video combining unit 6 is transmitted to the display unit 8 (HMD in the present embodiment).
  • the data unit 7 of e.g. a hard disk holds data to be delivered to the CG generation unit 5 .
  • data stored in the data unit 7 text information, panorama video images, three-dimensional CG data and the like are stored.
  • the data unit 7 transmits appropriate data to the CG generation unit 5 .
  • the data unit 7 sends three-dimensional CG data included in the field of view of the image sensing unit 1 to the CG generation unit 5 .
  • the data unit 7 is not limited to a hard disk but any storage medium such as a tape or a memory device can be used as long as it can store data.
  • the display unit 8 which is an HMD in the present embodiment displays the combined video image signal transmitted from the video combining unit 6 .
  • the HMD has a right-eye image display unit and a left-eye image display unit.
  • the video combining unit 6 generates a display image for right eye and a display image for left eye and supplies them to the HMD, thereby the user can experience three-dimensional CG image display.
  • the operation of the MR system as an example of the video combining apparatus according to the present embodiment having the above construction will be described with reference to the flowchart of FIG. 4 .
  • the data unit 7 holds necessary data in advance.
  • step S1 the system is started.
  • a video image is obtained from the image sensing unit 1 .
  • the video image is converted to an appropriate format image by the video capturing unit 2 , and sent to the video combining unit 6 and the CG elimination area extraction unit 3 .
  • the markers are extracted from the video image input in the CG elimination area extraction unit 3 , and a CG elimination area is calculated. Then the obtained CG elimination area is sent to the video combining unit 6 .
  • the image-sensing position and orientation measurement unit 4 measures the position and orientation of the image sensing unit 1 .
  • the measured position and orientation information is sent to the CG generation unit 5 .
  • the CG generation unit 5 estimates the field of view of the image sensing unit 1 from the position and orientation information transmitted from the image-sensing position and orientation measurement unit 4 , and obtains data in a range included in the field of view of the image sensing unit 1 , from the data unit 7 .
  • the CG generation unit 5 generates a CG image using the data obtained from the data unit 7 , and sends the generated video image to the video combining unit 6 .
  • the video combining unit 6 combines the video image transmitted from the video capturing unit 2 with the CG image transmitted from the CG generation unit 5 .
  • the CG image is not combined with the portion of the CG elimination area from the CG elimination area extraction unit 3 .
  • a combined video image where the CG image is eliminated from the CG elimination area is generated.
  • the combined video image is sent to the display unit 8 .
  • step S8 the video image information transmitted from the video combining unit 6 is displayed on the display unit 8 .
  • step S9 it is checked whether or not the system is ended. If YES, the system is ended at step S10, otherwise, the process returns to step S2 to repeat the above-described processing.
  • an MR system to display, when a user wears the HMD and looks at, e.g., a landscape, position information and names in correspondence with the landscape, even when an object of interest is hidden by CG, the object can be observed by holding the CG elimination frame in a corresponding position.
  • An example of the video combining apparatus is a medical assistant system to present an image for a doctor as if the inside of the patient's body is visualized.
  • an optical see-through HMD is used as the display device since the display resolution of video see-through HMD is limited.
  • FIGS. 5A and 5B show an example of the stylus. Note that in the following description, it is assumed that a view point position and orientation of the user is fixed. However, a relative relation between the view point position and orientation of the user and those of the stylus is considered practically.
  • a stylus 51 has e.g. a pen shape, and includes a position and orientation sensor.
  • a stylus end position is estimated from a distance d between the position detected by the position and orientation sensor and a distal end of the stylus, and an area designated by the end of the stylus is obtained from the stylus end position and a detected inclination ⁇ of the stylus.
  • an area corresponding to a virtual circle 52 in contact with the end of the stylus is defined as a CG elimination designation area.
  • an elliptic area obtained from the virtual circle 52 in correspondence with the inclination ⁇ of the stylus is a CG elimination area. Note that if the inclination of the stylus (orientation information) cannot be obtained, the virtual circle 52 can be utilized.
  • the position and orientation information of the stylus, and information on an ON-OFF switch (not shown) can be obtained from the outside via a signal line connected to the stylus or a communicator.
  • the position and orientation input device is employed as a user interface because:
  • the ON-OFF button of the stylus can be allocated to ON-OFF of CG elimination area definition.
  • CG image display method can be easily selected by simply selecting the “surgical tool with sensor” or a “surgical tool without sensor”.
  • FIG. 6 is a block diagram showing an example of the construction of the MR system according to the second embodiment.
  • a head position and orientation measurement unit 14 included in the HMD as the display unit 18 to be described later, transmits head position and orientation information of a user to the CG elimination area extraction unit 13 and the CG generation unit 15 in accordance with or without a request from the CG elimination area extraction unit 13 and the CG generation unit 15 .
  • a geomagnetic sensor, a gyroscopic or optical sensor or the like may be utilized as the head position and orientation measurement unit 14 .
  • a stylus state detection unit 19 obtains stylus information (position, orientation, button ON/OFF state and the like) from a stylus 20 , and in accordance with or without a request from the CG elimination area extraction unit 13 , transmits the information to the CG elimination area extraction unit 13 .
  • the CG elimination area extraction unit 13 calculates a CG elimination area from the position and orientation data inputted from the head position and orientation measurement unit 14 and the stylus information inputted from the stylus state detection unit 19 .
  • an end position of the stylus on an image plane and the orientation of the stylus to the image plane can be calculated from the position and orientation of the head and the position and orientation of the stylus.
  • An elliptic area (ellipticity is determined from the information on the orientation of the stylus to the image plane) spread on the image plane from the end of the stylus is defined as a CG elimination area.
  • the CG elimination area extraction unit 13 outputs the extracted CG elimination area to a video combining unit 16 .
  • the CG generation unit 15 inputs the head position and orientation information from the head position and orientation measurement unit 14 and estimates the position and direction of the head. As the field of view of the user can be obtained if the position and orientation are estimated, the CG generation unit 15 inputs data corresponding to a portion included in the field of view of the user from a data unit 17 , generates a CG image overlapped with the field of view of the user, and outputs it to the video combining unit 16 .
  • the video combining unit 16 reads the CG image from the CG generation unit 15 and the CG elimination area from the CG elimination area extraction unit 13 . Then the video combining unit 16 processes the CG image based on the CG elimination area data from the CG elimination area extraction unit 13 , and transmits the CG image to the display unit 18 .
  • the data unit 17 of e.g. a hard disk holds data to be delivered to the CG generation unit 15 .
  • data stored in the data unit 17 text information, panorama video images, three-dimensional CG data and the like are stored.
  • the data unit 17 transmits appropriate data to the CG generation unit 15 .
  • the data unit 17 sends three-dimensional CG data included in the field of view of the user to the CG generation unit 15 .
  • the data unit 17 is not limited to a hard disk but any storage medium such as a tape or a memory can be used as long as it can store data.
  • the display unit 18 here is an optical see-through HMD.
  • the display unit 18 displays the video image signal transmitted from the video combining unit 16 so that the video image overlaps on the real world seen through a half mirror by, e.g., projecting the video image signal on the half mirror.
  • step S11 the system is started.
  • the stylus state detection unit 19 detects the state of the stylus.
  • the detected information is sent to the CG elimination area extraction unit 13 .
  • the head position and orientation measurement unit 14 measures the position and orientation of the user.
  • the measured position and orientation information is sent to the CG elimination area extraction unit 13 and the CG generation unit 15 .
  • the CG generation area extraction unit 13 calculates a CG elimination area based on the stylus position and orientation information inputted from the stylus state detection unit 19 and the head position and orientation information inputted from the head position and orientation measurement unit 14 .
  • the CG elimination area is sent to the video combining unit 16 .
  • the CG generation unit 15 estimates the field of view of the user from the head position and orientation information transmitted from the head position and orientation measurement unit 14 , and obtains data in a range included in the field of view of the user, from the data unit 17 .
  • the CG generation unit 15 generates a CG image using the data obtained from the data unit 17 , and sends the generated video image to the video combining unit 16 .
  • the video combining unit 16 processes the CG image transmitted from the CG generation unit 15 based on the CG elimination area data from the CG elimination area extraction unit 13 (the CG image is not drawn in a portion of the CG elimination area transmitted from the CG elimination area extraction unit 13 ).
  • the video image is sent to the display unit 18 .
  • step S18 the video image information transmitted from the video combining unit 16 is displayed on the display unit 18 as an optical see-through HMD, thereby the user recognizes the CG image superimposed in real space.
  • step S19 it is checked whether or not the system is ended. If YES, the system is ended, otherwise, the process returns to step S12 to repeat the above-described processing.
  • CG image display very near the hands or CG image display not made very near the hands can be easily selected.
  • the frame as shown in FIGS. 2A to 2D is employed for designation of CG elimination area.
  • a CG elimination area can be designated with not the frame but a user's hands in the video combining apparatus according to the first embodiment.
  • FIGS. 9A and 9B an area surrounded with the user's hands (hatched area) as shown in FIGS. 9A and 9B is recognized as a CG elimination area. That is, the user forms an eye hole with his/her hand(s) thereby designates a desired area as a CG elimination area.
  • FIG. 9A shows an example of designation of CG elimination area with both hands
  • FIG. 9B an example of designation of CG elimination area with a single hand. In this manner, the CG elimination area can be designated with hand(s) and the frame is not necessary. Further, the designation of CG elimination area can be made by the user's natural action.
  • the video combining apparatus of the present embodiment has a construction to extract the area of the user's hand(s) from a video image from the user's view point position such that the hand(s) is always visible, and perform mask processing of not drawing a CG image in the area (visualizing an object which is hidden by the CG image in the user's sight).
  • This construction to perform the mask processing is realized by using e.g. a chroma key technique proposed in Japanese Published Unexamined Patent Application No. 2002-95535.
  • the mask processing on the hand includes a process of extraction of the area of the user's hand(s)
  • the internal area of the hand(s) can be easily extracted from a video image from the user's view point.
  • the video combining apparatus of the present embodiment can be realized only by adding processing of extracting the internal area of the hand(s) (the hatched area in FIGS. 9A and 9B ) in the video image from the user's view point to the MR system capable of hand mask processing.
  • the area of the user's hand(s) is extracted from the video image from the user's view point position, and further, the hand internal area (eye hole area) is extracted, thereby a designated area is obtained.
  • the extraction of the user's hand area in the video image from the user's view point and the restraint of drawing in the hand internal area solve the problem that the hand(s) positioned in the user's sight is hidden by the CG image, and further, enable clear visualization of a predetermined area in real space without obstruction of a CG image.
  • processing is simplified by handling the hand area and the hand internal area as a CG elimination area.
  • the hand area is handled separately from the CG elimination area (the hand internal area).
  • a flesh color portion is extracted as a hand area, and its internal area is detected as a CG elimination area.
  • it may be arranged such that the user wears a blue glove, then a blue area is extracted as a hand area and a flesh color CG image is combined with the hand area, and a CG image is not displayed in the CG elimination area.
  • FIG. 10 is a block diagram showing the construction of an MR system as an example of the video combining apparatus according to the third embodiment.
  • constituent elements corresponding to those in FIG. 3 have the same reference numerals and explanations thereof will be omitted.
  • the CG elimination area extraction unit 3 ′ extracts a hand area and an area surrounded with the hand area (hand internal area) from a video image inputted from the video capturing unit 2 and data on hand area extraction from the data unit 7 (for example, data defining the above-described particular color), if necessary.
  • the CG elimination area extraction unit 3 ′ extracts at least the hand internal area as a CG elimination area, and outputs the extracted CG elimination area to the video combining unit 6 .
  • the image-sensing position and orientation measurement unit 4 is included in the HMD. In accordance with or without a request from the CG generation unit 5 , the image-sensing position and orientation measurement unit 4 transmits the position and orientation information of the image sensing unit 1 to the CG generation unit 5 .
  • a geomagnetic sensor, a gyroscopic or optical sensor or the like may be utilized as the image-sensing position and orientation measurement unit 4 .
  • the CG generation unit 5 obtains the position and orientation information of the image sensing unit 1 from the image-sensing position and orientation measurement unit 4 , and estimates the position and image sensing direction of the image sensing unit 1 .
  • the CG generation unit 5 reads data included in the field of view of the image sensing unit 1 from a data unit 7 , generates a CG image to be combined with the video image obtained by the image sensing unit 1 , and outputs the CG image to the video combining unit 6 .
  • the video combining unit 6 reads the video image from the video capturing unit 2 , the CG image from the CG generation unit 5 , and the CG elimination area from the CG elimination area extraction unit 3 . Then the video combining unit 6 combines the CG image from the CG generation unit 5 with the video image from the video capturing unit 2 . At this time, the CG image is not drawn in a portion overlapped with the CG elimination area obtained by the CG elimination area extraction unit 3 . In this manner, a combined video image where only the CG image is eliminated from the CG elimination area is generated.
  • CG image generation unit 6 is transmitted to the display unit 8 (HMD in the present embodiment).
  • the data unit 7 of e.g. a hard disk holds data to be delivered to the CG generation unit 5 and the CG elimination area extraction unit 3 ′.
  • data stored in the data unit 7 text information, panorama video images, three-dimensional CG data, further, data necessary for extraction of particular area such as a hand area or a hand internal area (data defining a particular color or the like), and the like, are stored.
  • the data unit 7 transmits appropriate data to the CG generation unit 5 . For example, if a request for three-dimensional CG data to be combined in the field of view of the image sensing unit 1 is received from the CG generation unit 5 , the data unit 7 sends three-dimensional CG data included in the field of view of the image sensing unit 1 to the CG generation unit 5 .
  • the data unit 7 transmits appropriate data to the CG elimination area extraction unit 3 ′.
  • the display unit 8 which is an HMD in the present embodiment displays the combined video image signal transmitted from the video combining unit 6 .
  • the HMD has a right-eye image display unit and a left-eye image display unit.
  • the video combining unit 6 generates a display image for right eye and a display image for left eye and supplies them to the HMD, thereby the user can experience three-dimensional CG image display.
  • the operation of the MR system as an example of the video combining apparatus according to the third embodiment having the above construction will be described with reference to the flowchart of FIG. 11 .
  • the operation of the video combining apparatus of the present embodiment is the same as that in the first embodiment except that the order of the step of acquisition of image-sensing position and orientation information and the step of extraction of CG elimination area is inverted and that the content of the CG elimination area extraction processing is different.
  • the data unit 7 holds necessary data in advance.
  • step S1 the system is started.
  • a video image is obtained from the image sensing unit 1 .
  • the video image is converted to an appropriate format image by the video capturing unit 2 , and sent to the video combining unit 6 and the CG elimination area extraction unit 3 .
  • the image-sensing position and orientation measurement unit 4 measures the position and orientation of the image sensing unit 1 .
  • the measured position and orientation information is sent to the CG generation unit 5 .
  • a CG elimination area is calculated from the video image inputted into the CG elimination area extraction unit 3 ′.
  • step S4′ which is a characteristic step of the present embodiment will be described with reference to the flowchart of FIG. 12 .
  • step S4′ an example of step S4′ will be described about a case where a hand area is extracted by using image processing to extract a particular color.
  • the CG elimination area extraction unit 3 ′ reads data on a hand area, if necessary, from the data unit 7 .
  • data on a hand area information on flesh color of the hand or the like is used.
  • the data on hand area is read at once, however, in a case where the position of a light source changing in a real time manner is measured and flesh color data is required in correspondence with the changing light source position, the step is necessary.
  • a hand area is extracted from the video image input in the CG elimination area extraction unit 3 ′ from the data on the hand area.
  • step S4a-3 an internal area of the hand area on the video image is extracted.
  • the hand area and the internal area of the hand area on the video image are extracted as a CG elimination area.
  • step S4 is implemented using any other hand area extraction method in hand mask processing than the above processing.
  • the calculated CG elimination area is sent to the video combining unit 6 .
  • the CG generation unit 5 estimates the field of view of the image sensing unit 1 from the position and orientation information transmitted from the image-sensing position and orientation measurement unit 4 , and obtains data in a range included in the field of view of the image sensing unit 1 , from the data unit 7 .
  • the CG generation unit 5 generates a CG image using the data obtained from the data unit 7 , and sends the generated video image to the video combining unit 6 .
  • the video combining unit 6 combines the video image transmitted from the video capturing unit 2 with the CG image transmitted from the CG generation unit 5 .
  • the CG image is not combined with the portion of the CG elimination area from the CG elimination area extraction unit 3 .
  • a combined video image where the CG image is eliminated from the CG elimination area is generated.
  • the combined video image is sent to the display unit 8 .
  • step S8 the video image information transmitted from the video combining unit 6 is displayed on the display unit 8 .
  • step S9 it is checked whether or not the system is ended. If YES, the system is ended at step S10, otherwise, the process returns to step S2 to repeat the above-described processing.
  • an MR system to display when a user wears the HMD and looks at e.g. a landscape, position information and names in correspondence with the landscape, even if an object of interest is hidden by a CG image, the object can be observed by forming an eye hole with the user's hand(s) in a corresponding position.
  • the HMD is employed as a display unit, however, the present invention is applicable to a head up display (HUD) optical see-through AR system as disclosed in Japanese Published Unexamined Patent Application No. 10-051711, in which a superimposed image is generated in correspondence with a display device and a view point position.
  • HUD head up display
  • the optical see-through HMD is employed, however, the second embodiment is applicable to a system using a video see-through HMD as described in the first embodiment.
  • a CG elimination area is designated utilizing mask processing without any tool such as a frame, however, mask processing can be utilized even in designation of CG elimination area using a frame as shown in FIGS. 2A to 2D or the like.
  • a frame having a shape as shown in FIGS. 2A to 2D has a particular color, and a CG elimination area is defined as “internal area of the particular color”, thereby similar CG elimination processing to that of the third embodiment can be performed.
  • the frame is not necessarily provided with markers.
  • the particular color of the frame is not limited to a flesh color but may be blue, red or any color, however, it is preferable that the color is not included in a background color.
  • a hand area is extracted by utilizing mask processing, however, the hand area may be extracted by other processing than the mask processing. For example, it may be arranged such that the user wears a glove provided with plural position sensors, and the hand area is extracted from outputs from the sensors.
  • step S4b-1 the position of the hand is measured.
  • a hand area on a video image from the view point position of the user is calculated from the measured hand position information and view-point position information of the user.
  • step S4b-3 an internal area of the hand area on the video image from the view point position of the user is extracted.
  • a CG elimination area is calculated from the hand area and the internal area of the hand area on the video image from the view point position of the user.
  • the present invention includes a case where a software program to realize the functions of the above-described embodiments is supplied directly from a recording medium or via cable/radio communication to a system or apparatus having a computer capable of execution of the program, and the computer of the system or apparatus executes the supplied program thereby achieves equivalent functions.
  • the program code itself supplied and installed into the computer realizes the present invention. That is, the computer program itself to realize the functional processing of the present invention is included in the present invention.
  • the program having any form such as object code, an interpreter-executable program and script data supplied to an OS can be employed as long as it has a program function.
  • the storage medium such as a flexible disk, a hard disk, a magnetic recording medium such as a magnetic tape, an optical/magneto-optical storage medium such as an MO, a CD-ROM, a CD-R, a CD-RW, a DVD-ROM, a DVD-R and a DVD-RW, a nonvolatile semiconductor memory, and the like, can be used for providing the program code.
  • a data file (program data file) of a computer program itself or a compressed file having automatic installation function which can be a computer program forming the present invention on a client computer, is stored on a server on a computer network, and the program data file is downloaded to a connected client computer.
  • the program data file may be divided into plural segment files and stored on different servers.
  • the server apparatus for downloading the program data file to realize the functional processing of the present invention to plural users is included in the present invention.
  • the program of the present invention may be encrypted and stored on a storage medium such as a CD-ROM delivered to users, such that a user who satisfied a predetermined condition is allowed to download key information to decryption from a homepage via e.g. the Internet, then the program is decrypted with the key information and installed into a computer, thereby the present invention is realized.
  • a storage medium such as a CD-ROM delivered to users, such that a user who satisfied a predetermined condition is allowed to download key information to decryption from a homepage via e.g. the Internet, then the program is decrypted with the key information and installed into a computer, thereby the present invention is realized.
  • the present invention includes a case where an OS or the like working on the computer performs a part or entire actual processing in accordance with designations of the program code and realizes the functions of the above embodiments.
  • the present invention also includes a case where, after the program code read from the storage medium is written in a function expansion card which is inserted into the computer or in a memory provided in a function expansion unit which is connected to the computer, CPU or the like contained in the function expansion card or unit performs a part or entire process in accordance with designations of the program code and realizes the functions of the above embodiments.
  • an MR system to superimpose a CG image on real space, if a real space portion to be observed is hidden by the CG image, an area where the CG image is not to be displayed is simply designated and the CG image in the area is partially not displayed (deleted), thereby real space of interest can be observed.

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